Surface treating machine



Nov. 16, 1943. 1.. VAVRIK EFAL SURFACE TREATING MACHINE Original Filed May 4, 1942 2 Sheets-Sheet l "a W K W W l K 0 m m T U am 0 L m l... E w m \l. w 1 Q 5 m q E 5 d: /\l/ J w 9 6 5 3 5 a 1 2? 6 2 l1 v 0 WM 0 1 1 3 Nov. 16, 1943. L. VAVRIK ETAL 2,334,364

SURFACE TREATING MACHINE Original Filed May 4, 1942 2 Sheets-Sheet 2 2 [71/75 VAI/IQZK v ff'zmv: m I Ami N Patented Nov. 16, 1943 2,334,354 t XSUBFA CE TREATING ,MACHINE I Louis. .Vavrik, litossford, and Kenneth C. Atkin,

, I Toledo, Ohio, assignors to The American 'Floor A Surfacing Machine Company, Toledo, Ohio, a.

corporation of Ohio Original application May f 4, 1942, Serial No, 3 I 441,684. .Divided and this ap lication NoVember27,1942,.EerialNo.467.112 I n 3 Claims. tomes-94 4 b In hand machines oi this character, having a horizontally rotatable surface treating element,

the entire weight .of the machine during opera-j tion is customarily borne by such' element, which 7 rests on the surface being treated; and a truck is provided at the rear of the machine irarneor housing and adaptedto beplaced in raised or; inoperative position or to be lowered intofusable. position. to facilitate moving the machine from plate to. place when not operating, or to serve as a supporting fulcrum to assist in regulating the working pressure .of the treating element.

' object of this invention is theprovision of novel mounting and adjustment control for a truclgfin a machinejof the class described, wheretruck II for the machine is mounted inthe chamber 5. for vertical ..raising and lowering movements, and in the present "instance is carried by a mounting plate i which seats on 1 the housing I over thecharnber and has the portion thereof which carries the truck II projected through the opening 6. The-plate I0 rests on the housing with its edge irioverlappihg relation to the marginal edgewall of theopen? ing 6 and, is secured to the housing by screws," or in any'other suitable manner, thus forming a fixed separable part of the housing. The plate or mounting structure" H) also forms, a mount iorthe machine handle 4, but, as the mounting of the handle thereon is claimed in said former application and forms no part" of the present invention, it need not be described. In the present instance, the upper end por-{ ti'on oi'the plate Iil, within its marginal side by the operator by foot action can easily and quickly place the truck in one or'thelother of t P ition -1 ftherobje'cts and advantages or the invention will be apparent from the'following detaileddes'cription, and from, the accompanying I drawings illustrating one embodiment thereof, in'which Figure 1 is a central vertical fragmentary qn tudinal section of the rear'portion ore machine embodying the invention, with the truck in loweredposition; Fig; 2 is a, section on the line 22 inliig. 1; Fig. 3 is a front perspective view of a portion of the machine em! bodying the invention,.with parts broken away and one truck wheel -removed; Fig. 4 isa reduced fragmentary side elevation ofa machine embodying the invention, with parts broken away and with the truck in raised position, and Fig. 5 is a rear perspective view of the removable truck carrying means. a

Referring to the drawings, I designates the body housing of a machine embodyingthe invention and 2 the horizontally rotatablebrush or other floor treating element of the machine, which is driven in any suitable manner,- as well understood in the art.

'In the present embodiment of the invention the housing I is provided with a rear extension or part forming an open bottom compartment 5 having its top formed midway betweenits sides and upper end edge portionais bowed upwardly to form a dome iii to which the handle 4 is at tached, and its lower end portion is notched in; inverted U-form to form the side legs i6 and the notch or opening I'Ithereb'etween. 'I'he'truck II includes a pair of Wheels 39;; mounted on the ends of 'an axle or on stubshafts 31 carried by and projecting from oppo-x site endsofthe outer edge portion of a bolster 32.,.This bolster. proiectsjrearwardly from the axle and is pivotally connected atrits; inneror rear edge to bosses 33 onthe lower end portions oi the respective plate legs It at their inner sides, as shown at 34, and is adapted to have; limited swinging movements in a vertical plane. Springs 35 act on thebolster 32 to normally re; tain; the truck retracted in inoperative position within the compartment, 5, of, the machine house ing, as shown in Fig 4, land the truck is forced d t usable osit on; as. hown in Figs. 1.

and 2,by a depression of the foot' lever or pedal" I2. I I I The foot lever I2 is preferably of plate-form, being substantially the width of the base opening I! of the plate Ii] in which it is mounted, and is provided at its inner end witha cross-shaft 31 that is journaled at its ends in bosses 38 depending from the respective side wall portions of the dome part I5. Onthe under side of the foot lever I2 is provided a web '39 forming a cam which, in the present instance, when the lever is raised, coacts with the upper side of the bolster 32 to limit its upward movements, and, when the lever is lowered to the position shown in Fig. 1,00-

acts with the bolster to force the truck down into usable position and hold it there. The springs 35, in the present instance, connect the truck bolster 32 and foot lever l2 and tend to hold them in engaged relation. It is apparent that the manner of coaction of the cam 39 with the bolster 32 causes the foot lever to be yieldingly retained in either its raised or lowered position of adjustment. The foot lever is raised from the lowered position shown in Fig. 1 by the operator engaging under and raising up on the lower 1 edge of the lever with the toe of one foot, and

it is lowered by a downward pressure of a foot on the lever.

It is-apparent from the foregoing that the truck may be raised or lowered by movement of of said parts, together with the handle 6, if it is mounted on the plate ll] as in the present instance, may be removed, as a unit from the ma- 'chinefc ir the purpose of repair or replacement. It is to be understood, however, that the provision of there mova ble plate as a mounting for the truckv parts and also the attachment ormountingof the machine handle on such plate are not necessary parts of the invention, and the plate I0 may, if desired, constitute anintegral part of thev housing. I 7

We wish it understood that. our. invention is not limited to any specific construction, arrangement or form of the parta as itis capable of numerous modifications and changes without departing from the spirit of the claims.

Having thus described our invention, what we claim; as new, and desire to secure by United StatesLetters Patent, is:

1. In a machine of the class described, a housing having a rear portion forming an open bot tomedptruck receiving compartment with a rear opening,.a truck vertically movable in said compartment and including a rearwardly projecting bolster extending across said opening and pivoted at its rear end to the housing for vertical of the truckwhen the lever is moved in the op-' posite direction, and means operating to raise the truck when the lever is moved to permit same.

2. In a machine of the class described, the combination with a housing having'fa'n opening invits rearend portion and forming a chamber in advance of said opening for receiving atruck, amounting plate mounted on the housing over said compartment and having an opening therein in register with the compartment opening, a sup- 7 porting truck for the housing having a bolster pivotally mountedat its rear end on said plate crosswise of its opening for vertical swinging movements, said truck projecting forwardly,-

, from the plate through the housing opening and into said compartment, a foot lever'pivotally carried-by said plate crosswise of said opening 5V to said opening, said lever having a cam projection on its inner side in engagement with said bolster forwardly of itsswingin'g axisand intermediate of said wheels, said cam portion per mitting a raising of the truck to inoperative p05 swinging movements and carrying supporting I wheels at its forward end, a lever member pivoted to the housing above the forward end portion, of the truck bolster for vertical swinging movements through "said opening and having a portion coacting with said bolster forwardly of its" pivot andjintermediate the wheels to force the truck to lowered position when the lever is moved in one direction'and to'permit ,a raising raise the truck for vertical swinging movements and operable through the plate and housing opening, said lever having at its underside acam for coacting with the truck bolster forwardly of its pivot to force the truck down into' usable position when t the lever is depressed and permitting upward movement of the truck to inoperative position when the lever is raised, and means yieldingly acting on the truck to retain it in coaction with said cam.

\ 3. In a-machine of the class described, the

combination with a'housing having its rear'skirt portion provided with a rearwardly and downwardly extending opening and forming an open bottomed'truck receiving compartment in advance of the opening, a truck vertically movable in said compartment and'including a bolster. and truck 7 wheels carried thereby with the bolster pivotally' connected at its rear end to the housing at the sides of said opening near its lower end withthe truck wheels disposed at'the 'forward end p'orv tion of the bolster, a'lever member pivoted at its upper endto thehousing within said opening and above the forwardend portion of the bolster v and'normally extending downwardly'and rearwardly therefrom in substantial closing relation sition when the leverisraised a predetermined extent and acting on said bolster to force the truck downward to'operative position when the lever is swun'g'downward to the limit/of its low r n movement, and means yieldingly acting to A LOUIS VAVRIK. p I l 'C- j N- whenjthe lever is raisedto permit 

